STONY BROOK, N.Y. — Dunia Sibomana was considered the lucky one two years ago when a group of chimpanzees jumped from the trees and attacked him and two other boys as they played near a preserve in their native Democratic Republic of the Congo.

Dunia, unlike the others, survived. But he was severely disfigured: His lips were ripped off and one cheek torn apart, leaving him with muscle damage that makes it hard for him to eat, swallow and communicate.

Now, 8-year-old Dunia is set to undergo a rare and complicated surgery at a Long Island hospital that will use tissue and muscle from his forearm to recreate both lips. The hope is that he will once again be able to open and close his mouth, and eat and talk normally.

Dunia was disfigured when he was attacked by a group of chimpanzees while he was playing near a nature preserve in the Congo.AP

“As you can imagine, not having any lips, the food can just come right out,” said Dr. Leon Klempner, an associate professor of dentistry at Stony Brook Children’s Hospital, where Dunia will undergo the operation. “He drools all the time and can’t pronounce different words.”

Monday’s planned eight-hour procedure will be the first of three major operations for Dunia, who was brought from the Congo in November with the help of the nonprofit foundation Smile Rescue for Kids.

Dr. Alexander Dagum, the hospital’s chief of plastic and reconstructive surgery, said he believes there are only three other documented cases in which the same surgery has been performed. The hospital is covering the cost of the surgery and the doctors have all donated their time.

Since the attack, which killed Dunia’s 4-year-old brother and a young cousin, Dunia has been the target of bullies and become shy and withdrawn. In his short time in the United States, he has been living with a host family on Long Island, attending elementary school and learning English in addition to his native Swahili.

Appearing for an interview with this doctors on Monday, Dunia buried himself in video games on a tablet and colored with markers. He occasionally stuck his tongue out at the doctors as they explained the procedure.

“We’re feeling very optimistic,” Klempner said. “We’re hoping after the surgery, he’ll reintegrate into society and perhaps go back to school or have some semblance of a normal life.”